Perhaps you should try some spelling variations:
2.3.1 communication » 2.3.1.1 communication, 2.3 communication, 2.2.3 communication
developpement de » developpement des, developpement durable
technology 2.1 » technology 2.2, technology 3.1, technology 1
2.1 inflation » 2.3 inflation, 2.3.1 inflation, 2 inflation
inflation tax » inflation rate, inflation _, inflation target
crime 2.3.1 » crimes 9.3.1, time 2.3.1, crime 13.1
de fabrice » die fabrics, avec fabrice, die fabriken
tax crime » tax crimes, war crime, a crime

You may be able to get more results by adjusting your search query.

• Adding a wildcard symbol may retrieve word variants: technology 2.1 inflation tax crime 2.3.1 communication costs _ developpement de fabrice.*.